GB1337560A - Variable-gain low-noise amplifier - Google Patents
Variable-gain low-noise amplifierInfo
- Publication number
- GB1337560A GB1337560A GB5000772A GB5000772A GB1337560A GB 1337560 A GB1337560 A GB 1337560A GB 5000772 A GB5000772 A GB 5000772A GB 5000772 A GB5000772 A GB 5000772A GB 1337560 A GB1337560 A GB 1337560A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- current
- change
- gain control
- automatic gain
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000003990 capacitor Substances 0.000 abstract 2
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3005—Automatic control in amplifiers having semiconductor devices in amplifiers suitable for low-frequencies, e.g. audio amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/30—Automatic control in amplifiers having semiconductor devices
- H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Control Of Amplification And Gain Control (AREA)
Abstract
1337560 Automatic gain control THOMSONCSF 30 Oct 1972 [2 Nov 1971] 50007/72 Heading H3T In an automatic gain control circuit, signal Ie is applied to the commoned emitters of transistors Q1, Q2, which are supplied with standing current by means of a constant current D.C. source 4. An output is taken from the collector of transistor Q2, via a capacitor C, which also feeds an automatic gain control generator 10 which feeds a gain-controlling voltage to the base of transistor Q2. The change in standing current in transistor Q2 produces a voltage change across resistor R2, which is decoupled for A.C. signal by capacitor C1; this voltage change is amplified by an amplifier comprising transistors Q3, Q4 in long-tailed pair connection, resulting in a current which is fed back from the collector of transistor Q3 to the emitter of transistor Q2 to compensate for the change in standing current therein.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR7139217A FR2159545A5 (en) | 1971-11-02 | 1971-11-02 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1337560A true GB1337560A (en) | 1973-11-14 |
Family
ID=9085175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5000772A Expired GB1337560A (en) | 1971-11-02 | 1972-10-30 | Variable-gain low-noise amplifier |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US3761830A (en) |
| DE (1) | DE2158759A1 (en) |
| FR (1) | FR2159545A5 (en) |
| GB (1) | GB1337560A (en) |
| NL (1) | NL7214709A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL7614515A (en) * | 1976-12-29 | 1978-07-03 | Philips Nv | AMPLIFIER REGULATED IN AMPLIFICATION. |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3533005A (en) * | 1968-05-31 | 1970-10-06 | Hughes Aircraft Co | Highly linear gain-controlled video amplifier circuit |
-
1971
- 1971-11-02 FR FR7139217A patent/FR2159545A5/fr not_active Expired
- 1971-11-26 DE DE2158759A patent/DE2158759A1/en active Pending
-
1972
- 1972-02-14 US US00225735A patent/US3761830A/en not_active Expired - Lifetime
- 1972-10-30 GB GB5000772A patent/GB1337560A/en not_active Expired
- 1972-10-31 NL NL7214709A patent/NL7214709A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| NL7214709A (en) | 1973-05-04 |
| FR2159545A5 (en) | 1973-06-22 |
| DE2158759A1 (en) | 1973-05-10 |
| US3761830A (en) | 1973-09-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |